“Brook Schaaf gives us a road map for content monetization through affiliate marketing that applies to countless individuals and companies. Be prepared to take notes as you read this book. Brook shares fantastic insights into affiliate marketing that will help anyone from a teen trying to monetize their videos on the FYP on TikTok to a Fortune 500 CEO.”
— Shawn Collins
Co-founder, Affiliate Summit

“Brook Schaaf puts a bold new spin on affiliate marketing’s role in the digital economy. His book is an accessible read that reminds us why performance-based advertising remains the best dollar-for-dollar channel most marketers still underestimate. The Affiliate Hypothesis helps answer some of the most pressing questions in digital marketing today: Why is affiliate still stuck at the kids’ table—and how do we finally change that? An absolute must-read.”
— Todd Crawford
Co-founder & VP of Strategic Initiatives, impact.com

“Brook Schaaf has long been one of the true north stars in affiliate and performance marketing—a leader who not only champions the industry but actually expands the way others see it. In his new book, he connects the dots across adtech, partnerships, and brand trust in a way that makes the big picture both exciting and actionable. The Affiliate Hypothesis is a timely reminder that affiliate isn’t just a channel—it’s an ecosystem shaping how brands grow and build credibility. Brook’s perspective is invaluable for anyone serious about understanding where digital growth and trust truly intersect.”
— Tye DeGrange
CEO, RoundBarn Labs

“Brook offers a delightful overview of affiliate marketing—guiding readers through key tradeoffs so they can make smart decisions when starting, running, or joining affiliate marketing programs.”
— Ben Edelman
Independent researcher and consultant

“Brook is uniquely realistic and remains optimistic in his approach to affiliate marketing as a channel for growth. His hypothesis in this book tells that story! He has a commonsensical approach to embracing and understanding the affiliate industry not only in how it successfully operates but how it also applies in our everyday life!”
— Lee-Ann Johnstone
Founder, KonverJ.io

“Brook Schaaf combines his extensive knowledge of affiliate industry history with a forward-looking business acumen, making The Affiliate Hypothesis an engaging read for anyone who wants to better understand the landscape.”
— Tricia Meyer
Executive Director, Performance Marketing Association

"Sure to be a page turner." (Possibly said in irony.)
— Mike Dodd
General Partner, Silverton Partners